Write in Scientific Notation $7.68015 \times 10 ^ { - 6 }$

Multiple Choice

Write in scientific notation.
- 0.000000768015

A) $7.68015 \times 10 ^ { - 6 }$
B) $7.68015 \times 10 ^ { 7 }$
C) $7.68015 \times 10 ^ { 6 }$
D) $7.68015 \times 10 ^ { - 7 }$ 768015